core: remove useless append function

lib/include/irritator/core.hpp

@@ -402,21 +402,6 @@ public:
         return { buffer_, size_ };
     }
 
-    constexpr void append(const std::string_view str) noexcept
-    {
-        const size_t remaining = length - size_;
-
-        if (remaining) {
-            size_t copy = std::min(remaining - 1, str.size());
-            std::strncpy(buffer_ + size_, str.data(), copy);
-            copy += size_;
-            size_ = static_cast<unsigned char>(copy);
-            assert(size_ < length);
-
-            buffer_[size_] = '\0';
-        }
-    }
-
     constexpr void clear() noexcept
     {
         std::fill_n(buffer_, length, '\0');

lib/test/public-api.cpp

@@ -179,15 +179,15 @@ main()
         expect(f1 == "");
         expect(f1.size() == 0_ul);
 
-        f1.append("ok");
+        f1 = "ok";
         expect(f1 == "ok");
         expect(f1.size() == 2_ul);
 
-        f1.append("ok");
+        f1 = "okok";
         expect(f1 == "okok");
         expect(f1.size() == 4_ul);
 
-        f1.append("1234");
+        f1 = "okok123456";
         expect(f1 == "okok123");
         expect(f1.size() == 7_ul);