search[strlen(search)-1]='\0';这条指令什么意思?

char tracks[][80]={
"I,m the legend",
"The girl from Iwo Jima",
"Dancing with a Dork"
};

void find(char search[])
{
int i;
for(i=0;i<5;i++){
if (strstr(tracks[i],search))
printf("Track %i:'%s'\n",i,tracks[i]);
}
}
int main()
{
char search[80];
printf("Search for:");
fgets(search,80,stdin);

# ## search[strlen(search)-1]='\0'; /*这条指令什么意思*/

find(search);
return 0;

}

最后一个位置设置为结束符。