minor fixez

session_manager.cpp

@@ -113,7 +113,7 @@ int session_manager::remove(){
 std::string session_manager::appli_command(char comand[], char* n_package){
   char** args=new char*[5];
     args[0]="sudo";
-    args[1]=strcat(&this->env[0],"emerge");
+    args[1]=&(std::string(this->env)+std::string("emerge"))[0];
     args[2]=comand;
     args[3]=n_package;
     args[4]=nullptr;