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#include <stdio.h>#include <stdlib.h>#include <string.h>#define OPTIONAL  1#define MANDATORY 2char* allocate_node(size_t nodes_required, char* node_list, int flag, size_t timeout){char *cmd[256], *flag_str[10];if(flag == OPTIONAL)strcpy(flag_str, "optional");else if(flag == MANDATORY)strcpy(flag_str, "mandatory");sprintf(cmd, "allocate N=%d node_list=%s flag=%s timeout=%d",nodes_required, node_list, flag_str, timeout);return cmd;}int main() {char * rt = allocate_node(5, "node[001-003],node15", MANDATORY, 10);puts(rt);puts("********************************");char * str_rt = "jobid=116 response_node_list=node12,node13";char *node;node = strrchr(str_rt, '=');puts(node);node = node + 1;puts(node);putchar(*node);putchar('\n');puts("********************************");char str[256] = "";strcat(str, "node12");strcat(str, ",");strcat(str, "node15");strcat(str, ",");strcat(str, "node18");puts(str);puts("********************************");return EXIT_SUCCESS;}