remove redundant Bits.UInt64ToBigEndianBytes()

Author: ssg

src/Bits.cs

@@ -1,4 +1,9 @@
-using System;
+// <copyright file="Bits.cs" company="Sedat Kapanoglu">
+// Copyright (c) 2014-2025 Sedat Kapanoglu
+// Licensed under Apache-2.0 License (see LICENSE.txt file for details)
+// </copyright>
+
+using System;
 
 namespace SimpleBase
 {
@@ -36,25 +41,5 @@ internal static ulong PartialBigEndianBytesToUInt64(ReadOnlySpan<byte> bytes)
             }
             return result;
         }
-
-        /// <summary>
-        /// Converts a UInt64 to a byte array in big-endian order.
-        /// </summary>
-        /// <param name="value">Value to convert.</param>
-        /// <param name="output">Output buffer.</param>
-        /// <exception cref="ArgumentException">If the buffer is too small.</exception>
-        internal static void UInt64ToBigEndianBytes(ulong value, Span<byte> output)
-        {
-            if (output.Length < sizeof(ulong))
-            {
-                throw new ArgumentException("Output is too small", nameof(output));
-            }
-            int byteCount = sizeof(ulong);
-            for (int i = byteCount - 1; i >= 0; i--)
-            {
-                output[i] = (byte)(value & 0xFF);
-                value >>= 8;
-            }
-        }
     }
 }

src/MoneroBase58.cs

@@ -4,6 +4,7 @@
 // </copyright>
 
 using System;
+using System.Buffers.Binary;
 
 namespace SimpleBase;
 
@@ -212,7 +213,7 @@ enum DecodeResult
             }
             pad += (uint)value;
         }
-        Bits.UInt64ToBigEndianBytes(pad, output);
+        BinaryPrimitives.WriteUInt64BigEndian(output, pad);
         return (DecodeResult.Success, null);
     }