How to fix the fprintf loop?

I've got a .txt file written like this:

PersonName colour1 colour2 colour3

for example:

Nick blue green black
Lisa orange yellow green
Mark white blue orange

my program: editColour(fileName, colourInTheFile, colourIWant) should change the colourInTheFile with the colourIWant and return the number of times it did it. The problem is that it starts a loop

#include <stdio.h>
#include <string.h>

typedef char String[100];

int editColour(String fileName,String current_colour,String new_colour){

    String name,c1,c2,c3;

    int num_s = 0; /*number of occurence*/

    FILE *fp = fopen(fileName,"r");
    /*this is just a test, so i'm tryng to put the fileName content in this one*/
    FILE *ftemp = fopen("/Users/valerio/Desktop/PROGRAMMI/C/Lezione12_esercizio1/Lezione12_esercizio1/file.txt","w+");
    long pos;

    while(!feof(fp)){


        pos = ftell(fp);
        fscanf(fp, "%s %s %s %s\n",name,c1,c2,c3);


        if(strcmp(c1, current_colour)==0){

            fseek(fp,pos,SEEK_SET);
            fprintf(ftemp, "%s %s %s %s\n",name,new_colour,c2,c3);
            num_s++;

        }
        if(strcmp(c2, current_colour)==0){

            fseek(fp,pos,SEEK_SET);
            fprintf(ftemp, "%s %s %s %s\n",name,c1,new_colour,c3);
            num_s++;

        }
        if(strcmp(c3, current_colour)==0){

            fseek(fp,pos,SEEK_SET);
            fprintf(ftemp, "%s %s %s %s\n",name,c1,c2,new_colour);
            num_s++;

        }

        fprintf(ftemp, "%s %s %s %s\n",name,c1,c2,c3);

    }

    fclose(fp);
    fclose(ftemp);
    return num_s;

}

int main(int argc, const char * argv[]) {

    printf("%d\n\n", editColour("/Users/valerio/Desktop/PROGRAMMI/C/Lezione12_esercizio1/Lezione12_esercizio1/social_users copia.txt",
                                    "orange", "poop"));

}

expected :

       Nick blue green black
       Lisa poop yellow green
       Mark white blue poop (in the new file)

actual :

     Nick blue green black
     Lisa poop yellow green
     Lisa orange yellow green
     Lisa poop yellow green
     Lisa orange yellow green
     Lisa poop yellow green
     Lisa orange yellow green
     Lisa poop yellow green
     Lisa orange yellow green
      .
      .  
      .

in loop

the following proposed code:

1. cleanly compiles
2. performs the desired functionality
3. properly checks for errors
4. avoids the incorrect statement: while( !feof(fp) )

And now, the proposed code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_CHAR 100

int editColour( char fileName[], char current_colour[], char new_colour[] )
{
    char name[ MAX_CHAR ];
    char c1[ MAX_CHAR ];
    char c2[ MAX_CHAR ];
    char c3[ MAX_CHAR ];

    int num_s = 0; /*number of occurence*/

    FILE *fp = fopen(fileName,"r");
    if( !fp )
    {
        perror( "fopen for input file failed" );
        exit( EXIT_FAILURE );
    }

    FILE *ftemp = fopen("/Users/valerio/Desktop/PROGRAMMI/C/Lezione12_esercizio1/Lezione12_esercizio1/file.txt","w");
    if( !ftemp )
    {
        perror( "fopen for output file failed" );
        fclose( fp );
        exit( EXIT_FAILURE );
    }

    while( fscanf( fp, "%99s %99s %99s %99s\n", name, c1, c2, c3 ) == 4 )
    {
        if( !strcmp( c1, current_colour ) )
        {
            fprintf( ftemp, "%s %s %s %s\n", name, new_colour, c2, c3 );
            num_s++;
        }

        if( !strcmp( c2, current_colour ) )
        {
            fprintf( ftemp, "%s %s %s %s\n", name, c1, new_colour, c3 );
            num_s++;
        }

        if( !strcmp( c3, current_colour ) )
        {
            fprintf( ftemp, "%s %s %s %s\n", name, c1, c2, new_colour );
            num_s++;
        }

        else
        {
            fprintf( ftemp, "%s %s %s %s\n", name, c1, c2, c3 );
        }

    }

    fclose(fp);
    fclose(ftemp);
    return num_s;
}


int main( void ) 
{
    printf("%d\n\n", 
        editColour("/Users/valerio/Desktop/PROGRAMMI/C/Lezione12_esercizio1/Lezione12_esercizio1/social_users copia.txt",
           "orange", "poop"));
}