Replace a sub-string in string in C Programming

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/* Replace a sub-string in a string */

#include<stdio.h>
#include<string.h>  
int index_str1,index_str2,k;
int c[100];  
int str_rep(char *, char *, int *);
 
/* Function str that finds first location of the sub-string */
 
int str_rep(char *s1, char *s2, int c[])
{
    int count = 0;
    int l =0;
    int j, i = 0;
    char s3[]= "Los Angeles";
    for(index_str1 = 0;  s1[index_str1]; index_str1++)
        for(index_str2=index_str1, k = 0; s1[index_str2] == s2[k]&&s1[index_str1]; index_str2++, k++)
            if(!s2[k+1])
            {
                count ++;
                c[l++] = index_str1;
                for(j = index_str1; j < strlen(s3)+index_str1;  j++)
                    s1[j] = s3[i++];
                printf("\n %s ", s1);
            }
 
    return(count);
}
 
/* Function main */
 
void main()
{
    char *s;
    int c[100];
    char s1[]="Michael Jackson";
    char s2[] ="Jackson";
    int count;
    str_rep(s1, s2,c);
} 

Posted in: Programming in C