c - My program doesn't print a string -

i'm making program delete spaces in c , count how many space deletes. program counts spaces doesn't print string doesn't have spaces. i'll show code:

#include <stdio.h> #include <stdlib.h>  /*  *   */ char delete_spaces(char oracion[100]) {     int i;     (i=0;oracion[i]!='\0';i++){         if (oracion[i]==' '&&oracion[i+1]==' '){             oracion[i]=oracion[i+1];         }       }     return(oracion[100]); }  int count_spaces(char oracion[100]) {     int i,number_spaces=0;     (i=0;oracion[i]!='\0';i++){         if (oracion[i]==' '&&oracion[i+1]==' '){             number_spaces+=1;         }      }     return(number_spaces); }  int main(void){     char frase[100],frase2[100];     int num_spaces;     printf("write here phrase:");     gets(frase);     frase2[100]=delete_spaces(frase);     num_spaces=count_spaces(frase);     printf("%s",frase2);     printf("%d",num_spaces);     return 0; } 

could need?:

#include<stdio.h> #include<stdlib.h> #include<string.h>  int delete_spaces(char *s1,char *s2){      int found = 0;     int = 0, j = 0;      while(s1[i] != '\0'){         if (((s1[i] == ' ') && (s1[i+1] == ' ')) || ((s1[i] == '\t') && (s1[i+1] == '\t'))){             found++;         } else {             s2[j++] = s1[i];         }         i++;     }     s2[j] = '\0';      printf("s2 = %s\n",s2);     return found; }  int main(void){     char frase[100], frase2[100];     int num_spaces;      printf("write here phrase:");     if((fgets(frase,99,stdin)) == null){         printf("error\n");     }      num_spaces=delete_spaces(frase,frase2);     printf("number of deleted spaces = %d\n",num_spaces);     return 0; } 

output:

i'm going    sleep           goodbye         s2 = i'm going sleep goodbye  number of deleted spaces = 13