Makes NO SENSE

[hellowonn]

I wrote this function.

char* GetExtension(char* cFile)
{
    char* cExt = (char*)malloc(30);
	 int i,x,z;
	 for(i=0;i<strlen(cFile);i++){
		 if(cFile[i] == '.'){
			 for(x=i+1;x<strlen(cFile);x++){
				cExt[z++] = cFile[x];
			 }
			 cExt[z++] = '\0';
			 z++;
		 }
	 }
    return cExt;
}

I call it in main, it works fine.

char* pNoSense = GetExtension("***NOSENSE.txt");
printf("NO SENSE: %s\n",pNoSense);
free(pNoSense);
return 0;

I call it later again in my program and it doesn't seem to return any output. I started putting it in random places to see *** the problem is, and at some places it even crashes the damn thing. Help?