add support of linuxArm64 target

common/src/linuxArm64Main/kotlin/fixed.kt

@@ -0,0 +1,25 @@
+package dev.inmo.micro_utils.common
+
+import kotlinx.cinterop.*
+import platform.posix.snprintf
+import platform.posix.sprintf
+
+@OptIn(ExperimentalForeignApi::class)
+actual fun Float.fixed(signs: Int): Float {
+    return memScoped {
+        val buff = allocArray<ByteVar>(Float.SIZE_BYTES * 2)
+
+        sprintf(buff, "%.${signs}f", this@fixed)
+        buff.toKString().toFloat()
+    }
+}
+
+@OptIn(ExperimentalForeignApi::class)
+actual fun Double.fixed(signs: Int): Double {
+    return memScoped {
+        val buff = allocArray<ByteVar>(Double.SIZE_BYTES * 2)
+
+        sprintf(buff, "%.${signs}f", this@fixed)
+        buff.toKString().toDouble()
+    }
+}