模板和无效函数调用C++

所以我的错误是，当我调用 void 函数时，我收到一条错误消息，指出没有匹配的函数调用test_string。下一个错误指出候选模板被忽略：无法推断模板参数"T"。 我对模板很陌生，我不确定为什么当我的test_string函数没有错误并且所有模板化函数都在同一个文件中时会出现此错误。

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
//typedef string T;
//=======FUNCTION DECLARATION==========
template<typename T>
T* add_entry(T* list, const T& new_entry,
int& size, int& capacity);
template<typename T>
T* get_entry(T* list, const T& new_entry,
int& size, int& capacity);
template<typename T>
T* remove_entry(T* list, const T& delete_me,
int& size, int& capacity);
template<typename T>
T* allocate(int capacity);
template<typename T>
void copy_list(T *dest, T* src, int many_to_copy);
template<typename T>
void release(T* list, int size);
template<typename T>
T* search_entry(T* list, const T& find_me, int size);
template<typename T>
void print_list(T* list, int size);
template<typename T>
void test_string();
int main(){
//no matching function call
test_string();
//the main error
//candidate template ignored
//couldn't infer template 'T'

return 0;
}
//=======FUNCTION DEFINITION==========
template<typename T>
T* add_entry(T* list, const T& new_entry,
int& size, int& capacity){
return get_entry(list,new_entry,size,capacity);
}
template<typename T>
T* get_entry(T* list, const T& new_entry,
int& size, int& capacity){
//   T*  walker = new T[size];
//   walker = list;
list = new T[size];
for(int i = 0;i<size+2;i++){
//    *walker = new_entry;
list[i]=new_entry;
size++;
if(size==capacity){
capacity*=2;
}
list++;
}
return list;
}
template<typename T>
T* remove_entry(T* list, const T& delete_me,
int& size, int& capacity){
}
template<typename T>
T* allocate(int capacity){
const bool debug = false;
if(debug) cout<<"allocate: capacity: "<<capacity<<endl;
return new T[capacity];
}
template<typename T>
void copy_list(T *dest, T* src, int many_to_copy){
for(int i = 0;i<many_to_copy;i++){
dest = src;
}
}
template<typename T>
void release(T* list, int size){
for(int i = 0;i<size;i++){
list++;
}
delete list;
}
template<typename T>
T* search_entry(T* list, const T& find_me, int size){
for(int i = 0;i<size;i++){
if(*list==find_me){
return list;
}
list++;
}
}
template<typename T>
void print_list(T* list, int size){
for(int i = 0;i<size;i++){
cout<<*list;
}
//    cout<<endl;
}
template<typename T>
void test_string(){
int cap = 3;
int size = 0;
T* list = allocate;
list = add_entry(list,"Erika" , size, cap);
print_list(list,size);
}