Function to find the first occurence of a string within another

strfind.c

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

const char *strfind(const char *s, const char *f);

int main(int argc, char **argv){

    const char *s = argv[1];
    const char *f = argv[2];

    printf("%s, %s, %s\n", s, f, strfind(s, f));

    return 0;
}

// Function to find the first occurence of a string within another
// Returns a pointer if found, NULL otherwise
const char *strfind(const char *s, const char *f){
    
    int i, j, sLength, fLength, match;
    const char *found = NULL;
    
    sLength = strlen(s);
    fLength = strlen(f);

    // Loop through each character in f
    for (i = 0; i < fLength; i++){
        
        // For each character in s, check if we have an initial match
        for (j = 0; j < sLength; j++){
            
            // If we have a match, move to the next character, otherwise break
            if (f[i+j] == s[j]){
                match = 1;
            } else {
                match = 0;
                break;
            }

        }

        // Set found to the first character that was matched and break
        if (match) {
            found = &f[i];
            break;
        }
    }

    return found;
}