Add Swap feature

src/handle_get_printable_amount.c

@@ -0,0 +1,33 @@
+#include "handle_get_printable_amount.h"
+#include "shared_context.h"
+#include "ethUtils.h"
+#include "utils.h"
+#include "uint256.h"
+#include "string.h"
+#include <stdint.h>
+
+
+void handle_get_printable_amount( get_printable_amount_parameters_t* params, chain_config_t *config) {
+    uint8_t decimals;
+    char ticker[MAX_TICKER_LEN];
+    os_memset(params->printable_amount, 0, sizeof(params->printable_amount));
+    if (params->amount_length > 32) {
+        PRINTF("Amount is too big, 32 bytes max but buffer has %u bytes", params->amount_length);
+        os_lib_end();
+    }
+    if(!parse_swap_config(params->coin_configuration, params->coin_configuration_length, ticker, &decimals)){
+        PRINTF("Error while parsing config\n");
+        os_lib_end();
+    }
+
+    // If the amount is a fee, its value is nominated in ETH even if we're doing an ERC20 swap
+    if(params->is_fee){
+        uint8_t ticker_len = strnlen(config->coinName, sizeof(config->coinName));
+        memcpy(ticker, config->coinName, ticker_len);
+        ticker[ticker_len] = ' ';
+        ticker[ticker_len+1] = '\0';
+        decimals = WEI_TO_ETHER;
+    }
+
+    amountToString(params->amount, params->amount_length, decimals, ticker, params->printable_amount, sizeof(params->printable_amount));
+}